[6] The six acres on the eastern part of the campus were purchased from the Albon family of Clearwater, Florida for CA$20,000 on 28 August 1962.

[6] This resulted in the addition of a teacher's cafeteria in 1962 and a technical studies area in 1963, often referred to as the Tech Wing,[7] on the southwestern part of the school.

[6] In 1991, a new library facility was constructed adjacent to the Tech Wing, which also resulted in the creation of an inner courtyard.

[8] In 2006, the student body comprised residents from the following communities:[7] Its current boundaries are all King township, and a portion of Oak Ridges west of Yonge Street south of 15th Sideroad.

King City Secondary School follows the curriculum standards set by the Ontario Ministry of Education.

[10] King City Secondary School had an annual Marine Biology Science Trip to the Florida Keys.

Established in 1990, the goal of the field trip is to demonstrate to students the relationship between ecosystems and human activity.

[14] Initially, fifteen athletes were identified for selection to the program, primarily those with intention to succeed to national competition.

The KCSS Alumni Association has organized school reunions quinquennially (every five years) since 1986, and has presented a student from each graduating class with a bursary of $300 since 1988.

[1] In 2002, it established a "Case of Distinction" to honour former students who have made outstanding contributions or achievements locally, nationally, or internationally.

[1] The 1995 movie To Die For had a number of scenes shot at King City Secondary School.

A lottery was held for $2 per ticket to determine which attending students would be cast as extras in the scenes filmed at the school.

Walt Disney's Confessions of a Teenage Drama Queen, which debuted in 2004, also had some scenes filmed during a three-day period in July 2003 at King City Secondary School.

The revenue generated from the filming rights of this movie assured sufficient capital for the construction of a new music room.